Furnace grate



March 4 1925, 1,455,559

H. B. HOLT I v FURNACE v GRATE Filed March 23. 1923 I v //v vs/vroe 7W5. MW

- siding at Dorinont,

TO ELQSEDALL FOUNDRY & IvIACHINE 0031313511535, 07" EITTSBUBGH,PENESYLJADlI h, COEPO'fi-AI ON OF PENNSYLVANIA.

' FURNACE Application filed Harsh 2-3, 1823. Serial No. 644,045.

concern.

I, l'lARRlS HOLT, re in the county of Allegheny and State ofPennsylvania, a citizen or" the United States, have invented ordiscovered certain new and useful Improvements in Furnace Grates, ofwhich improvements the following is a specification.

My invention relates to furnace grates, and particularly toendless-chain grates, and consists specifically of a grate link whichmay be'inscrted by way. of replacement in To all whom it may Be it knownthat an assembler grate structure, without the necessity of taking thestructure apart.

In an application for Letters Patent of the United States filed by meJuly 14, 1922, Serial No. 575,059, I have described a grate structure,andto such a structure as that my present invention is applicable.

In the accompanying agnientary view in plan from above of fr 7 l .testructure in which my invention is section, on the plane indicated bythe line llll, ig. 1; Figs. ill and IV are views larger scale showinginside. and front levation one of the linl halves, in which in pr sentinventioncenters.

Tl e grate is r ade up of links pivoted to other and grate bars borne bythe links. are indicated in the drawings by 1, and th pinspivoting'thein The grate indicated meral The links are elongate cast irn provided at their ends ith transverse holes for the pivot pins. mu udeof links is assembled and is by the vot pins articulated to constitutean enllss chain belt. The arrangement in this res iect is a familiarone, and will on hrietexaniination of the drawings be recognized. Thelin 4:. are arranged in transverse rows; they stand apart at intervalsqual to the thickness of a link; the ends of the nks of adjacent rowsare interlocked; and the pivot pins unite them, 1o. with row, throughthe so interlocked ends. Thus the successive rows o1 linils stand inechelon formation, while the whole articulated assembly forms an endlessfiex'ible belt, with openings-or meshes between the links. Thisopen*.vorl: character of thestruc-ture permits passage 01 air insulhcient quantities to nourish conibustion of fuel resting on the gratebars drawings Fig. I is sent: Fl II is view in lon 'itudinal,

/ b b v through it.

above. The endless belt so constituted will be understood to be carriedon opposite sprocket wheels, as is usual.

ilach linl: is pr vide d on one side With outstanding;- esentiallyT-shaped lug-13. This lug substantially wice as wide as is the body ofi3 link troniwhich it extends. he esseinbl is made the links theselig'ned lugs or ijacent links form substan- -ially continuous T-shapedrails extending cross the belt from side to side. And every row of linescarries such a compound rail.

The grate bars 3 are (excepting only the 'nal bars, which need not herebe con d) identical. 'lhey are essentially j supporting plates,ordinarily iron castoach. provided underneath with two versely extendingconvergent lugsel',

ne and form an opening, by which burs may be strung upon and re T-snapedrails of the chain ire. lhe grate bars are strung one he rails, a'lterthe links t ie manner already den assembled. The grate bars. "'ed standin close succession and succeed ope another closely. They that whenassembled they lap, in testudo formation, both transt finally of thestructure. ters are ful y explained in application, mentioned. above,

little more than half cylinders in their extent. The break in thecontinuity (a, Fig. IV) is so arranged that, when the link half standsin'the vertical position shown in Figs. H and IV, the edges oi: thebreak extend beyond the vertical plane through the axis of pivot, bothabove and below. The break'however is sutliciently wide to adinitpassage of the pivot pin laterally Finally the link half at its lowerinner corner is truncated, as, at b, Fig. IV, so that the two linkhalves may be epplied by rotary movement around the pivotal center. Thesurfaces 0, however, abut when the link halves are assembled, and whenthey are so assembled, and a grate bar 3 applied, the structure islocked against separation, except by removal again of the grate bar.

The assembly is sufliciently indicated in Fig. 11. Two link halves areapplied to adjacent pins 2 and brought to position, back to back. Thisis accomplished, as has been indicated, by rotary movement of one orboth link halves in bringing them to place. When they are brought toposition back to back, their lateral extensions form part of thecontinuous T-shaped bar which extends across the assembled belt. Thegrate bars are strung on, and these bars, or such one or more of them asoverlie the link of modified structure, lock its halves, so that thepair serve as though they were an integral piece.

The grate may be built up, using chiefly such link halves, with only asufficient number of the links 1 with complete eyes 12 to keep adjacentpivot pins 2 from separating and hold the Whole integrated. Primarily Iintend using these link halves as repair parts. If a link breaks, 'it isnot necessary to take the Whole apart in order to make repair; itsuiiices to remove the grate bars, crack away with a hammer the piecesof the broken link, and then to re place the link so broken and removedwith a pair of the repair parts of my invention. The grate bars may thenbe replaced and the grate is again in good condition.

I claim as my invention:

1. In a chain grate the combination with a plurality of links and pivotrods connected thereby, said links being surmounted by fuel supportingmembers, of a sectional structure between two of said pivot rods saidstructure consisting of two symmetrically formed parts, each of which isformed with a recess adapted toengage one of said rods and said parts,when in operative position, cooperating to form a T-shaped, laterallyextending lug, adapted for engagement with a fuel supporting member, anda fuel supporting member engaged therewith, and serving to lock saidparts in operative position.

2. A replacement member for a chain grate which includes in itsstructure links, pivot rods, and fuel-supporting members, saidreplacement member adapted to form with a companion piece a replacementpart for a grate link, said member being-provided at one end with arecess adapted to engage a pivot rod of the grate structure, and at theopposite end presenting a square surface for abutment upon a companionpiece, and being provided further intermediate its ends with aprojection adapted to form with a corresponding projection upon thecompanion piece a lug for engagement by a fuel supporting member of thegrate.

In testimony whereof I have hereunto set my hand.

HARRIS B. HOLT. lVitnesses BAYARD H. CHRIsTY, PERCY A. ENGLISH.

